///
/// delegate declaration
///
///
///
///
public delegate int NumberOperation(int fvalue, int svalue);
///
/// Button click event it will call NumberOper method
///
///
/// 

private void btnClick_Click(object sender, EventArgs e)
{
int a = Convert.ToInt16(txtfvalue.Text);
int b = Convert.ToInt16(txtsvalue.Text);
txtresult.Text = NumberOper(a, b, Add).ToString();//Dynamic we Assign Method name
}
///
/// Button click event it will call NumberOper method
///
///
/// 

private void btnSub_Click(object sender, EventArgs e)
{
int a = Convert.ToInt16(txtfvalue.Text);
int b = Convert.ToInt16(txtsvalue.Text);
txtresult.Text = NumberOper(a, b, Sub).ToString(); //Dynamic we Assign Method name
}
///
/// Main Method with delegate Parameter
///
/// first value
/// second value
/// Dynamic Delegate
/// call method add or sub and return result

public int NumberOper(int a, int b, NumberOperation AT)
{
return AT(a, b);
}
///
/// Add two numbers Methos
///
/// first Value
/// Second value
/// Result

public int Add(int a, int b)
{
return a + b;
}
///
/// Sub two number
///
/// first value
/// Second value
/// int value

public int Sub(int a, int b)
{
return a - b;
}

• Its reference to method.
• once method assign to delegate its work like method
• delegate method used any other method

Where we will use real time?

If you want to call Function in Runtime .and to get data after you can call your function but method name you don't know design time but you know runtime during time you can use "Delegate"

Different type of Delegate:
Single cast Delegate
Multicast Delegate

Single cast Delegate Syntax:

Below are signature of single cast delegate

Access-modifier delegate result-type identifier ([parameters]);

Access-modifier è Its Access permission for delegate (like public ,private ..,)

Delegate è it's a Keyword

Result-type èthis is return type (like int,string,void)

Identifier è delegate name (user define)

Parameter è run time value passing

Ex :

Way 1:

public delegate void jsdelegate();

above example is no return type ,no parameter

Way 2:

public delegate string jsdelegatevalue(int x,int y);

above example is string is return type and x,y is parameter

above 2 way are delegate declaration

· 'A' for Address,
· 'B' for Binding
· 'C' for Contracts.
Address(WHERE): Address specifies the info about where to find the service.
Binding(HOW): Binding specifies the info for how to interact with the service.
Contracts(What): Contracts specifies the info for how the service is implemented and what it offers.

· Windows Communication Foundation is a programming platform and runtime system for building, configuring and deploying network-distributed services.

WCF services provide better reliability and security in compared to ASMX web services.
In WCF, there is no need to make much change in code for implementing the security model and changing the binding. Small changes in the configuration will make your requirements. 

WCF has integrated logging mechanism, changing the configuration file settings will provide this functionality.

WCF services can be debugged now in Visual Studio 2008 /2010. Wcfsvchost.exe will do it for you because service will be self hosted when you start debugging.

WCF vs WebService:

Wcf and Webservice have some difference

 

Features	Web Service	WCF
Hosting	It can be hosted in IIS	It can be hosted in IIS, windows activation service, Self-hosting, Windows service
Programming	[WebService] attribute has to be added to the class	[ServiceContraact] attribute has to be added to the class
Model	[WebMethod] attribute represents the method exposed to client	[OperationContract] attribute represents the method exposed to client
Operation	One-way, Request- Response are the different operations supported in web service	One-Way, Request-Response, Duplex are different type of operations supported in WCF
XML	System.Xml.serialization name space is used for serialization	System.Runtime.Serialization namespace is used for serialization
Encoding	XML 1.0, MTOM(Message Transmission Optimization Mechanism), DIME, Custom	XML 1.0, MTOM, Binary, Custom
Transports	Can be accessed through HTTP, TCP, Custom	Can be accessed through HTTP, TCP, Named pipes, MSMQ,P2P, Custom
Protocols	Security	Security, Reliable messaging, Transactions

   It is an optional XML File which stores configuration details for a specific asp.net web application.

What is Machine.config File?

The Machine.Config file, which specifies the settings that are global to a particular machine. This file is located at the following path:

\WINNT\Microsoft.NET\Framework\[Framework Version]\CONFIG\machine.config

As web.config file is used to configure one asp .net web application, same way Machine.config file is used to configure the application according to a particular machine. That is, configuration done in machine.config file is affected on any application that runs on a particular machine. Usually, this file is not altered and only web.config is used which configuring applications.

You can override settings in the Machine.Config file for all the applications in a particular Web site by placing a Web.Config file in the root directory of the Web site as follows:

\InetPub\wwwroot\Web.Config

Macine Config VS WebConfiguration

Difference between Machine.Config and Web.Config

Machine.Config:

i) This is automatically installed when you install Visual Studio. Net.
ii) This is also called machine level configuration file.
iii)Only one machine.config file exists on a server.
iv) This file is at the highest level in the configuration hierarchy.

Web.Config:

i) This is automatically created when you create an ASP.Net web application project.

ii) This is also called application level configuration file.

iii)This file inherits setting from the machine.config

2D array contain 2 pair of values
Performance PERF
2D Array are slower to index elements than 1D arrays. They are sometimes more memory
2D Array String
String[,] os=new string[,]{
{"dev","Svalue"},
{"devenvexe","JValue"}

};
2D Array Int:
int[,] os=new int[,]{ {1,2}, {3,4} };
Get the Upperbound to Loop:
string[,] ad = new string[,]
{
{"dev", "devenvexe"},
{"TCS", "Tata"},
{"CTS", "Cogn"},
};

// Get the upper bound to loop.
//Upper bound means specify the dimention (0 or 1)
for (int i = 0; i <= ad.GetUpperBound(0); i++)
{
string FDim = ad[i, 0]; // JS, TCS, CTS...
string SDim = ad[i, 1]; // J Suqare, Tata, Cogn...
MessageBox.Show(FDim);
MessageBox.Show(SDim);
}
If you want use Length keyword .it will return 6 so
string[,] ad = new string[,]
{
{"dev", "devenvexe"},
{"TCS", "Tata"},
{"CTS", "Cogn"},
};

// Get the upper bound to loop.
//Upper bound means specify the dimention (0 or 1)
for (int i = 0; i <= ad.Length/2; i++)
{
string FDim = ad[i, 0]; // JS, TCS, CTS...
string SDim = ad[i, 1]; // J Suqare, Tata, Cogn...
MessageBox.Show(FDim);
MessageBox.Show(SDim);
}
GetUpperBound VS Length:
Its faster to use Array Length

Looping Speed:

GetUpperBound: 142 ms
Length/2 : 47 ms

// Int means data type suppose if you want string,bool,etc…
// value is data type
// length means ,you can enter int value

Ex:

String val=new String[3];

Ex Program:

Using system;
Class Progra
{
//Public void button Click
Sting val=new String[3];
Val[0]="devenvexe";
Val[1]="Suthahar";
Val[2]="Suresh";
Foreach(string n in Val)
{
MesageBox.Show(n.Tostring);
}
}

The format String Syntax is like {indexNumber:formatCharacter}

Object arg0 : The object to be formatted.

Returns:

String : The formatted String

Examples :

Currency :

String.Format("{0:c}", 10) will return $10.00

The currency symbol ($) displayed depends on the global locale settings.

Date :

String.Format("Today's date is {0:D}", DateTime.Now)

You will get Today's date like : 01 January 2005

Time :

String.Format("The current time is {0:T}", DateTime.Now)

You will get Current Time Like : 10:10:12
--
J.SuThahar MCA

MicroSoft Technology Specialist

Microsoft Certified ProfessionalDeveloper

www.jsuthahar.tk

09943151415